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-rw-r--r--drivers/gpio/Kconfig7
-rw-r--r--drivers/gpio/Makefile1
-rw-r--r--drivers/gpio/gpio-ich.c79
-rw-r--r--drivers/gpio/gpio-twl6040.c137
4 files changed, 214 insertions, 10 deletions
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 8382dc832929..aa73ef3233b8 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -409,6 +409,13 @@ config GPIO_TWL4030
Say yes here to access the GPIO signals of various multi-function
power management chips from Texas Instruments.
+config GPIO_TWL6040
+ tristate "TWL6040 GPO"
+ depends on TWL6040_CORE
+ help
+ Say yes here to access the GPO signals of twl6040
+ audio chip from Texas Instruments.
+
config GPIO_WM831X
tristate "WM831x GPIOs"
depends on MFD_WM831X
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 0ffaa8423e87..b2c109d1303d 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_GPIO_TPS6586X) += gpio-tps6586x.o
obj-$(CONFIG_GPIO_TPS65910) += gpio-tps65910.o
obj-$(CONFIG_GPIO_TPS65912) += gpio-tps65912.o
obj-$(CONFIG_GPIO_TWL4030) += gpio-twl4030.o
+obj-$(CONFIG_GPIO_TWL6040) += gpio-twl6040.o
obj-$(CONFIG_GPIO_UCB1400) += gpio-ucb1400.o
obj-$(CONFIG_GPIO_VR41XX) += gpio-vr41xx.o
obj-$(CONFIG_GPIO_VT8500) += gpio-vt8500.o
diff --git a/drivers/gpio/gpio-ich.c b/drivers/gpio/gpio-ich.c
index b7c06517403d..d4d617966696 100644
--- a/drivers/gpio/gpio-ich.c
+++ b/drivers/gpio/gpio-ich.c
@@ -49,6 +49,10 @@ static const u8 ichx_regs[3][3] = {
{0x0c, 0x38, 0x48}, /* LVL[1-3] offsets */
};
+static const u8 ichx_reglen[3] = {
+ 0x30, 0x10, 0x10,
+};
+
#define ICHX_WRITE(val, reg, base_res) outl(val, (reg) + (base_res)->start)
#define ICHX_READ(reg, base_res) inl((reg) + (base_res)->start)
@@ -75,6 +79,7 @@ static struct {
struct resource *pm_base; /* Power Mangagment IO base */
struct ichx_desc *desc; /* Pointer to chipset-specific description */
u32 orig_gpio_ctrl; /* Orig CTRL value, used to restore on exit */
+ u8 use_gpio; /* Which GPIO groups are usable */
} ichx_priv;
static int modparam_gpiobase = -1; /* dynamic */
@@ -123,8 +128,16 @@ static int ichx_read_bit(int reg, unsigned nr)
return data & (1 << bit) ? 1 : 0;
}
+static int ichx_gpio_check_available(struct gpio_chip *gpio, unsigned nr)
+{
+ return (ichx_priv.use_gpio & (1 << (nr / 32))) ? 0 : -ENXIO;
+}
+
static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
{
+ if (!ichx_gpio_check_available(gpio, nr))
+ return -ENXIO;
+
/*
* Try setting pin as an input and verify it worked since many pins
* are output-only.
@@ -138,6 +151,9 @@ static int ichx_gpio_direction_input(struct gpio_chip *gpio, unsigned nr)
static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
int val)
{
+ if (!ichx_gpio_check_available(gpio, nr))
+ return -ENXIO;
+
/* Set GPIO output value. */
ichx_write_bit(GPIO_LVL, nr, val, 0);
@@ -153,6 +169,9 @@ static int ichx_gpio_direction_output(struct gpio_chip *gpio, unsigned nr,
static int ichx_gpio_get(struct gpio_chip *chip, unsigned nr)
{
+ if (!ichx_gpio_check_available(chip, nr))
+ return -ENXIO;
+
return ichx_read_bit(GPIO_LVL, nr);
}
@@ -161,6 +180,9 @@ static int ich6_gpio_get(struct gpio_chip *chip, unsigned nr)
unsigned long flags;
u32 data;
+ if (!ichx_gpio_check_available(chip, nr))
+ return -ENXIO;
+
/*
* GPI 0 - 15 need to be read from the power management registers on
* a ICH6/3100 bridge.
@@ -291,6 +313,46 @@ static struct ichx_desc intel5_desc = {
.ngpio = 76,
};
+static int __devinit ichx_gpio_request_regions(struct resource *res_base,
+ const char *name, u8 use_gpio)
+{
+ int i;
+
+ if (!res_base || !res_base->start || !res_base->end)
+ return -ENODEV;
+
+ for (i = 0; i < ARRAY_SIZE(ichx_regs[0]); i++) {
+ if (!(use_gpio & (1 << i)))
+ continue;
+ if (!request_region(res_base->start + ichx_regs[0][i],
+ ichx_reglen[i], name))
+ goto request_err;
+ }
+ return 0;
+
+request_err:
+ /* Clean up: release already requested regions, if any */
+ for (i--; i >= 0; i--) {
+ if (!(use_gpio & (1 << i)))
+ continue;
+ release_region(res_base->start + ichx_regs[0][i],
+ ichx_reglen[i]);
+ }
+ return -EBUSY;
+}
+
+static void ichx_gpio_release_regions(struct resource *res_base, u8 use_gpio)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(ichx_regs[0]); i++) {
+ if (!(use_gpio & (1 << i)))
+ continue;
+ release_region(res_base->start + ichx_regs[0][i],
+ ichx_reglen[i]);
+ }
+}
+
static int __devinit ichx_gpio_probe(struct platform_device *pdev)
{
struct resource *res_base, *res_pm;
@@ -329,12 +391,11 @@ static int __devinit ichx_gpio_probe(struct platform_device *pdev)
}
res_base = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_GPIO);
- if (!res_base || !res_base->start || !res_base->end)
- return -ENODEV;
-
- if (!request_region(res_base->start, resource_size(res_base),
- pdev->name))
- return -EBUSY;
+ ichx_priv.use_gpio = ich_info->use_gpio;
+ err = ichx_gpio_request_regions(res_base, pdev->name,
+ ichx_priv.use_gpio);
+ if (err)
+ return err;
ichx_priv.gpio_base = res_base;
@@ -374,8 +435,7 @@ init:
return 0;
add_err:
- release_region(ichx_priv.gpio_base->start,
- resource_size(ichx_priv.gpio_base));
+ ichx_gpio_release_regions(ichx_priv.gpio_base, ichx_priv.use_gpio);
if (ichx_priv.pm_base)
release_region(ichx_priv.pm_base->start,
resource_size(ichx_priv.pm_base));
@@ -393,8 +453,7 @@ static int __devexit ichx_gpio_remove(struct platform_device *pdev)
return err;
}
- release_region(ichx_priv.gpio_base->start,
- resource_size(ichx_priv.gpio_base));
+ ichx_gpio_release_regions(ichx_priv.gpio_base, ichx_priv.use_gpio);
if (ichx_priv.pm_base)
release_region(ichx_priv.pm_base->start,
resource_size(ichx_priv.pm_base));
diff --git a/drivers/gpio/gpio-twl6040.c b/drivers/gpio/gpio-twl6040.c
new file mode 100644
index 000000000000..dd58e8b25043
--- /dev/null
+++ b/drivers/gpio/gpio-twl6040.c
@@ -0,0 +1,137 @@
+/*
+ * Access to GPOs on TWL6040 chip
+ *
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ *
+ * Authors:
+ * Sergio Aguirre <saaguirre@ti.com>
+ * Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kthread.h>
+#include <linux/irq.h>
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/of.h>
+
+#include <linux/mfd/twl6040.h>
+
+static struct gpio_chip twl6040gpo_chip;
+
+static int twl6040gpo_get(struct gpio_chip *chip, unsigned offset)
+{
+ struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
+ int ret = 0;
+
+ ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
+ if (ret < 0)
+ return ret;
+
+ return (ret >> offset) & 1;
+}
+
+static int twl6040gpo_direction_out(struct gpio_chip *chip, unsigned offset,
+ int value)
+{
+ /* This only drives GPOs, and can't change direction */
+ return 0;
+}
+
+static void twl6040gpo_set(struct gpio_chip *chip, unsigned offset, int value)
+{
+ struct twl6040 *twl6040 = dev_get_drvdata(chip->dev->parent);
+ int ret;
+ u8 gpoctl;
+
+ ret = twl6040_reg_read(twl6040, TWL6040_REG_GPOCTL);
+ if (ret < 0)
+ return;
+
+ if (value)
+ gpoctl = ret | (1 << offset);
+ else
+ gpoctl = ret & ~(1 << offset);
+
+ twl6040_reg_write(twl6040, TWL6040_REG_GPOCTL, gpoctl);
+}
+
+static struct gpio_chip twl6040gpo_chip = {
+ .label = "twl6040",
+ .owner = THIS_MODULE,
+ .get = twl6040gpo_get,
+ .direction_output = twl6040gpo_direction_out,
+ .set = twl6040gpo_set,
+ .can_sleep = 1,
+};
+
+/*----------------------------------------------------------------------*/
+
+static int __devinit gpo_twl6040_probe(struct platform_device *pdev)
+{
+ struct twl6040_gpo_data *pdata = pdev->dev.platform_data;
+ struct device *twl6040_core_dev = pdev->dev.parent;
+ struct twl6040 *twl6040 = dev_get_drvdata(twl6040_core_dev);
+ int ret;
+
+ if (pdata)
+ twl6040gpo_chip.base = pdata->gpio_base;
+ else
+ twl6040gpo_chip.base = -1;
+
+ if (twl6040_get_revid(twl6040) < TWL6041_REV_ES2_0)
+ twl6040gpo_chip.ngpio = 3; /* twl6040 have 3 GPO */
+ else
+ twl6040gpo_chip.ngpio = 1; /* twl6041 have 1 GPO */
+
+ twl6040gpo_chip.dev = &pdev->dev;
+#ifdef CONFIG_OF_GPIO
+ twl6040gpo_chip.of_node = twl6040_core_dev->of_node;
+#endif
+
+ ret = gpiochip_add(&twl6040gpo_chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "could not register gpiochip, %d\n", ret);
+ twl6040gpo_chip.ngpio = 0;
+ }
+
+ return ret;
+}
+
+static int __devexit gpo_twl6040_remove(struct platform_device *pdev)
+{
+ return gpiochip_remove(&twl6040gpo_chip);
+}
+
+/* Note: this hardware lives inside an I2C-based multi-function device. */
+MODULE_ALIAS("platform:twl6040-gpo");
+
+static struct platform_driver gpo_twl6040_driver = {
+ .driver = {
+ .name = "twl6040-gpo",
+ .owner = THIS_MODULE,
+ },
+ .probe = gpo_twl6040_probe,
+ .remove = gpo_twl6040_remove,
+};
+
+module_platform_driver(gpo_twl6040_driver);
+
+MODULE_AUTHOR("Texas Instruments, Inc.");
+MODULE_DESCRIPTION("GPO interface for TWL6040");
+MODULE_LICENSE("GPL");